Successful Proof of Concept for Quantum-Safe Cryptography Transition

• •Proof of concept confirms seamless migration to Post-Quantum Cryptography.
• •Transition aims to protect against future quantum computer attacks on current cryptography.
• •Integration of a secondary root certificate allows for dual-use of existing and new cryptographic algorithms.

TOPPAN Holdings, NICT, and ISARA have completed a proof of concept demonstrating a seamless transition from current cryptography to Post-Quantum Cryptography (PQC) for certificate authority frameworks. This initiative addresses the vulnerabilities of existing public-key cryptosystems to potential quantum computer attacks. The proof of concept involved a secondary crypto-agile root certificate integrated into a smart card system, allowing for a dual-use environment of both current and PQC algorithms. The simulation showed that this transition could occur without service disruptions, crucial for sectors like healthcare, finance, and government. The work was part of a broader initiative supported by the Council for Science, Technology and Innovation (CSTI). Details of the proof will be presented at the QUANTUM COMPUTING EXPO TOKYO from April 15 to 17, 2026. This development is critical as the migration to PQC is necessary to maintain the confidentiality of communications in the face of emerging quantum threats.